Finding the Fourth Proportional to 1,144.95, 1,580.12 and 647.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.95 : 1,580.12 = 647.62 : x
2. Step 2: Convert to fraction form
   1,144.95/1,580.12 = 647.62/x
3. Step 3: Cross multiply
   1,144.95x = 1,580.12 × 647.62
4. Step 4: Simplify right side
   1,144.95x = 1,023,317.31
5. Step 5: Solve for x
   x = 1,023,317.31/1,144.95
6. Step 6: Final answer
   x = 893.77